// Copyright 2017 Dolphin Emulator Project5~5~5~
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "DolphinQt/Config/Graphics/GeneralWidget.h"

#include <QCheckBox>
#include <QComboBox>
#include <QGridLayout>
#include <QGroupBox>
#include <QHBoxLayout>
#include <QLabel>
#include <QMessageBox>
#include <QRadioButton>
#include <QSignalBlocker>
#include <QVBoxLayout>

#include "Core/Config/GraphicsSettings.h"
#include "Core/ConfigManager.h"
#include "Core/Core.h"

#include "DolphinQt/Config/Graphics/GraphicsBool.h"
#include "DolphinQt/Config/Graphics/GraphicsChoice.h"
#include "DolphinQt/Config/Graphics/GraphicsRadio.h"
#include "DolphinQt/Config/Graphics/GraphicsWindow.h"
#include "DolphinQt/Settings.h"

#include "UICommon/VideoUtils.h"

#include "VideoCommon/VideoBackendBase.h"
#include "VideoCommon/VideoConfig.h"

GeneralWidget::GeneralWidget(X11Utils::XRRConfiguration* xrr_config, GraphicsWindow* parent)
    : GraphicsWidget(parent), m_xrr_config(xrr_config)
{
  CreateWidgets();
  LoadSettings();
  ConnectWidgets();
  AddDescriptions();
  emit BackendChanged(QString::fromStdString(SConfig::GetInstance().m_strVideoBackend));

  connect(parent, &GraphicsWindow::BackendChanged, this, &GeneralWidget::OnBackendChanged);
  connect(&Settings::Instance(), &Settings::EmulationStateChanged, this,
          [=](Core::State state) { OnEmulationStateChanged(state != Core::State::Uninitialized); });
  OnEmulationStateChanged(Core::GetState() != Core::State::Uninitialized);
}

void GeneralWidget::CreateWidgets()
{
  auto* main_layout = new QVBoxLayout;

  // Basic Section
  auto* m_video_box = new QGroupBox(tr("Basic"));
  m_video_layout = new QGridLayout();

  m_backend_combo = new QComboBox();
  m_aspect_combo =
      new GraphicsChoice({tr("Auto"), tr("Force 16:9"), tr("Force 4:3"), tr("Stretch to Window")},
                         Config::GFX_ASPECT_RATIO);
  m_adapter_combo = new QComboBox;
  m_enable_vsync = new GraphicsBool(tr("V-Sync"), Config::GFX_VSYNC);
  m_enable_fullscreen = new QCheckBox(tr("Use Fullscreen"));

  m_video_box->setLayout(m_video_layout);

  for (auto& backend : g_available_video_backends)
    m_backend_combo->addItem(tr(backend->GetDisplayName().c_str()),
                             QVariant(QString::fromStdString(backend->GetName())));

  m_video_layout->addWidget(new QLabel(tr("Backend:")), 0, 0);
  m_video_layout->addWidget(m_backend_combo, 0, 1);

  m_video_layout->addWidget(new QLabel(tr("Adapter:")), 1, 0);
  m_video_layout->addWidget(m_adapter_combo, 1, 1);

  m_video_layout->addWidget(new QLabel(tr("Aspect Ratio:")), 3, 0);
  m_video_layout->addWidget(m_aspect_combo, 3, 1);

  m_video_layout->addWidget(m_enable_vsync, 4, 0);
  m_video_layout->addWidget(m_enable_fullscreen, 4, 1);

  // Other
  auto* m_options_box = new QGroupBox(tr("Other"));
  auto* m_options_layout = new QGridLayout();

  m_show_fps = new GraphicsBool(tr("Show FPS"), Config::GFX_SHOW_FPS);
  m_show_ping = new GraphicsBool(tr("Show NetPlay Ping"), Config::GFX_SHOW_NETPLAY_PING);
  m_log_render_time =
      new GraphicsBool(tr("Log Render Time to File"), Config::GFX_LOG_RENDER_TIME_TO_FILE);
  m_autoadjust_window_size = new QCheckBox(tr("Auto-Adjust Window Size"));
  m_show_messages =
      new GraphicsBool(tr("Show NetPlay Messages"), Config::GFX_SHOW_NETPLAY_MESSAGES);
  m_render_main_window = new QCheckBox(tr("Render to Main Window"));

  m_options_box->setLayout(m_options_layout);

  m_options_layout->addWidget(m_show_fps, 0, 0);
  m_options_layout->addWidget(m_show_ping, 0, 1);

  m_options_layout->addWidget(m_log_render_time, 1, 0);
  m_options_layout->addWidget(m_autoadjust_window_size, 1, 1);

  m_options_layout->addWidget(m_show_messages, 2, 0);
  m_options_layout->addWidget(m_render_main_window, 2, 1);

  // Other
  auto* shader_compilation_box = new QGroupBox(tr("Shader Compilation"));
  auto* shader_compilation_layout = new QGridLayout();

  const std::array<const char*, 4> modes = {{
      "Synchronous",
      "Synchronous (Ubershaders)",
      "Asynchronous (Ubershaders)",
      "Asynchronous (Skip Drawing)",
  }};
  for (size_t i = 0; i < modes.size(); i++)
  {
    m_shader_compilation_mode[i] = new GraphicsRadioInt(
        tr(modes[i]), Config::GFX_SHADER_COMPILATION_MODE, static_cast<int>(i));
    shader_compilation_layout->addWidget(m_shader_compilation_mode[i], static_cast<int>(i / 2),
                                         static_cast<int>(i % 2));
  }
  m_wait_for_shaders = new GraphicsBool(tr("Compile Shaders Before Starting"),
                                        Config::GFX_WAIT_FOR_SHADERS_BEFORE_STARTING);
  shader_compilation_layout->addWidget(m_wait_for_shaders);
  shader_compilation_box->setLayout(shader_compilation_layout);

  main_layout->addWidget(m_video_box);
  main_layout->addWidget(m_options_box);
  main_layout->addWidget(shader_compilation_box);
  main_layout->addStretch();

  setLayout(main_layout);
}

void GeneralWidget::ConnectWidgets()
{
  // Video Backend
  connect(m_backend_combo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
          this, &GeneralWidget::SaveSettings);
  connect(m_adapter_combo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
          this, [](int index) {
            g_Config.iAdapter = index;
            Config::SetBaseOrCurrent(Config::GFX_ADAPTER, index);
          });

  for (QCheckBox* checkbox : {m_enable_fullscreen, m_render_main_window, m_autoadjust_window_size})
    connect(checkbox, &QCheckBox::toggled, this, &GeneralWidget::SaveSettings);
}

void GeneralWidget::LoadSettings()
{
  // Video Backend
  m_backend_combo->setCurrentIndex(m_backend_combo->findData(
      QVariant(QString::fromStdString(SConfig::GetInstance().m_strVideoBackend))));

  // Enable Fullscreen
  m_enable_fullscreen->setChecked(SConfig::GetInstance().bFullscreen);

  // Render to Main Window
  m_render_main_window->setChecked(SConfig::GetInstance().bRenderToMain);

  // Autoadjust window size
  m_autoadjust_window_size->setChecked(SConfig::GetInstance().bRenderWindowAutoSize);
}

void GeneralWidget::SaveSettings()
{
  // Video Backend
  const auto current_backend = m_backend_combo->currentData().toString().toStdString();
  if (SConfig::GetInstance().m_strVideoBackend != current_backend)
  {
    if (current_backend == "Software Renderer")
    {
      QMessageBox confirm_sw(this);

      confirm_sw.setIcon(QMessageBox::Warning);
      confirm_sw.setWindowModality(Qt::WindowModal);
      confirm_sw.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
      confirm_sw.setWindowTitle(tr("Confirm backend change"));
      confirm_sw.setText(tr("Software rendering is an order of magnitude slower than using the "
                            "other backends.\nIt's only useful for debugging purposes.\nDo you "
                            "really want to enable software rendering? If unsure, select 'No'."));

      if (confirm_sw.exec() != QMessageBox::Yes)
      {
        m_backend_combo->setCurrentIndex(m_backend_combo->findData(
            QVariant(QString::fromStdString(SConfig::GetInstance().m_strVideoBackend))));
        return;
      }
    }
    emit BackendChanged(QString::fromStdString(current_backend));
  }

  // Enable Fullscreen
  SConfig::GetInstance().bFullscreen = m_enable_fullscreen->isChecked();
  // Autoadjust window size
  SConfig::GetInstance().bRenderWindowAutoSize = m_autoadjust_window_size->isChecked();
  // Render To Main
  SConfig::GetInstance().bRenderToMain = m_render_main_window->isChecked();
}

void GeneralWidget::OnEmulationStateChanged(bool running)
{
  m_backend_combo->setEnabled(!running);
  m_render_main_window->setEnabled(!running);

  m_adapter_combo->setEnabled(!running);
}

void GeneralWidget::AddDescriptions()
{
// We need QObject::tr
#if defined(_WIN32)
  static const char TR_BACKEND_DESCRIPTION[] = QT_TR_NOOP(
      "Selects which graphics API to use internally.\n\nThe software renderer is extremely "
      "slow and only useful for debugging, so you will want to use either OpenGL, Direct3D, "
      "or Vulkan. Different games and different GPUs will behave differently on each "
      "backend, so for the best emulation experience it is recommended to try each and "
      "select the backend that is least problematic.\n\nIf unsure, select OpenGL.");
#else
  static const char TR_BACKEND_DESCRIPTION[] =
      QT_TR_NOOP("Selects what graphics API to use internally.\nThe software renderer is extremely "
                 "slow and only useful for debugging, so unless you have a reason to use it you'll "
                 "want to select OpenGL here.\n\nIf unsure, select OpenGL.");
#endif
  static const char TR_ADAPTER_DESCRIPTION[] =
      QT_TR_NOOP("Selects a hardware adapter to use.\n\nIf unsure, use the first one.");
  static const char TR_FULLSCREEN_DESCRIPTION[] = QT_TR_NOOP(
      "Enable this if you want the whole screen to be used for rendering.\nIf this is disabled, a "
      "render window will be created instead.\n\nIf unsure, leave this unchecked.");
  static const char TR_AUTOSIZE_DESCRIPTION[] =
      QT_TR_NOOP("Automatically adjusts the window size to your internal resolution.\n\nIf unsure, "
                 "leave this unchecked.");

  static const char TR_RENDER_TO_MAINWINDOW_DESCRIPTION[] =
      QT_TR_NOOP("Enable this if you want to use the main Dolphin window for rendering rather than "
                 "a separate render window.\n\nIf unsure, leave this unchecked.");
  static const char TR_ASPECT_RATIO_DESCRIPTION[] = QT_TR_NOOP(
      "Select what aspect ratio to use when rendering:\nAuto: Use the native aspect "
      "ratio\nForce 16:9: Mimic an analog TV with a widescreen aspect ratio.\nForce 4:3: "
      "Mimic a standard 4:3 analog TV.\nStretch to Window: Stretch the picture to the "
      "window size.\n\nIf unsure, select Auto.");
  static const char TR_VSYNC_DESCRIPTION[] =
      QT_TR_NOOP("Wait for vertical blanks in order to reduce tearing.\nDecreases performance if "
                 "emulation speed is below 100%.\n\nIf unsure, leave this unchecked.");
  static const char TR_SHOW_FPS_DESCRIPTION[] =
      QT_TR_NOOP("Show the number of frames rendered per second as a measure of "
                 "emulation speed.\n\nIf unsure, leave this unchecked.");
  static const char TR_SHOW_NETPLAY_PING_DESCRIPTION[] =
      QT_TR_NOOP("Show the players' maximum Ping while playing on "
                 "NetPlay.\n\nIf unsure, leave this unchecked.");
  static const char TR_LOG_RENDERTIME_DESCRIPTION[] =
      QT_TR_NOOP("Log the render time of every frame to User/Logs/render_time.txt. Use this "
                 "feature when you want to measure the performance of Dolphin.\n\nIf "
                 "unsure, leave this unchecked.");
  static const char TR_SHOW_NETPLAY_MESSAGES_DESCRIPTION[] =
      QT_TR_NOOP("When playing on NetPlay, show chat messages, buffer changes and "
                 "desync alerts.\n\nIf unsure, leave this unchecked.");
  static const char TR_SHADER_COMPILE_SYNC_DESCRIPTION[] =
      QT_TR_NOOP("Ubershaders are never used. Stuttering will occur during shader "
                 "compilation, but GPU demands are low. Recommended for low-end hardware.\n\nIf "
                 "unsure, select this mode.");
  static const char TR_SHADER_COMPILE_SYNC_UBER_DESCRIPTION[] = QT_TR_NOOP(
      "Ubershaders will always be used. Provides a near stutter-free experience at the cost of "
      "high GPU performance requirements. Only recommended for high-end systems.");
  static const char TR_SHADER_COMPILE_ASYNC_UBER_DESCRIPTION[] =
      QT_TR_NOOP("Ubershaders will be used to prevent stuttering during shader compilation, but "
                 "specialized shaders will be used when they will not cause stuttering. In the "
                 "best case it eliminates shader compilation stuttering while having minimal "
                 "performance impact, but results depend on video driver behavior.");
  static const char TR_SHADER_COMPILE_ASYNC_SKIP_DESCRIPTION[] = QT_TR_NOOP(
      "Prevents shader compilation stuttering by not rendering waiting objects. Can work in "
      "scenarios where Ubershaders doesn't, at the cost of introducing visual glitches and broken "
      "effects. Not recommended, only use if the other options give poor results on your system.");
  static const char TR_SHADER_COMPILE_BEFORE_START_DESCRIPTION[] =
      QT_TR_NOOP("Waits for all shaders to finish compiling before starting a game. Enabling this "
                 "option may reduce stuttering or hitching for a short time after the game is "
                 "started, at the cost of a longer delay before the game starts. For systems with "
                 "two or fewer cores, it is recommended to enable this option, as a large shader "
                 "queue may reduce frame rates. Otherwise, if unsure, leave this unchecked.");

  AddDescription(m_backend_combo, TR_BACKEND_DESCRIPTION);
  AddDescription(m_adapter_combo, TR_ADAPTER_DESCRIPTION);
  AddDescription(m_aspect_combo, TR_ASPECT_RATIO_DESCRIPTION);
  AddDescription(m_enable_vsync, TR_VSYNC_DESCRIPTION);
  AddDescription(m_enable_fullscreen, TR_FULLSCREEN_DESCRIPTION);
  AddDescription(m_show_fps, TR_SHOW_FPS_DESCRIPTION);
  AddDescription(m_show_ping, TR_SHOW_NETPLAY_PING_DESCRIPTION);
  AddDescription(m_log_render_time, TR_LOG_RENDERTIME_DESCRIPTION);
  AddDescription(m_autoadjust_window_size, TR_AUTOSIZE_DESCRIPTION);
  AddDescription(m_show_messages, TR_SHOW_NETPLAY_MESSAGES_DESCRIPTION);
  AddDescription(m_render_main_window, TR_RENDER_TO_MAINWINDOW_DESCRIPTION);
  AddDescription(m_shader_compilation_mode[0], TR_SHADER_COMPILE_SYNC_DESCRIPTION);
  AddDescription(m_shader_compilation_mode[1], TR_SHADER_COMPILE_SYNC_UBER_DESCRIPTION);
  AddDescription(m_shader_compilation_mode[2], TR_SHADER_COMPILE_ASYNC_UBER_DESCRIPTION);
  AddDescription(m_shader_compilation_mode[3], TR_SHADER_COMPILE_ASYNC_SKIP_DESCRIPTION);
  AddDescription(m_wait_for_shaders, TR_SHADER_COMPILE_BEFORE_START_DESCRIPTION);
}

void GeneralWidget::OnBackendChanged(const QString& backend_name)
{
  m_backend_combo->setCurrentIndex(m_backend_combo->findData(QVariant(backend_name)));

  const QSignalBlocker blocker(m_adapter_combo);

  m_adapter_combo->clear();

  const auto& adapters = g_Config.backend_info.Adapters;

  for (const auto& adapter : adapters)
    m_adapter_combo->addItem(QString::fromStdString(adapter));

  const bool supports_adapters = !adapters.empty();

  m_adapter_combo->setCurrentIndex(g_Config.iAdapter);
  m_adapter_combo->setEnabled(supports_adapters && !Core::IsRunning());

  m_adapter_combo->setToolTip(supports_adapters ?
                                  QStringLiteral("") :
                                  tr("%1 doesn't support this feature.")
                                      .arg(tr(g_video_backend->GetDisplayName().c_str())));
}
